Hello Caton and welcome,
I'm afraid you may be setting yourself up for failure due to the small size of that marine tank; we want to see you get off to a good start, and I do wish you the best of success... please read Myth No. 1 here:
http://www.aquahobby.com/board/viewtopic.php?t=24970_________________Keepin' marines happy for 25 years